Incubator-alarm



A. OLSON.

INCUBATOR ALARM.

APPLICATION FILED NOV. 21; 1918.

1,384,628. Patented July 12, 1921.

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1244A WW UNITED STATES PATENT OFFICE,

ARTHUR OLSON, or osLo, MINNESOTA.

INCUBATOR-ALARM.

Application filed November 27, 1918.

the tempe'i'ature within the same rises above a certain point or drops below a certain point an alarm indicating the fact will be sounded. A further purpose is to provide a device of this character which may be readily attachable to an incubator at present in use.

Other and further purposes of the invention will appear in the following description wherein the same is set forth in detail.

To the exact construction in which itis shown and described the invention is not to be restricted. The right is reserved to make such changes or alterations as the actual reduction of practice may suggest, in so far as such changes or alterations are compatible in spirit with the annexed claim.

In the accompanying drawings:

Figure 1 is a view in side elevation of the improved attachment showing it attached on the wall of an incubator av portion of which is shown in section.

Fig. 2 is a top plan view of the device.

Re't'erringto the drawings, the invention is shown as comprising a bracket made preferably of cast iron'and having a horizontal arm 1 and an upright arm 2. the latter being attachable to the side wall 3 of an incubator bv means of appropriate screws 4. To the eittremitv ot' the arm 1 there is attached a bracket between which and the arm an insulating strip 6 is inserted. The bracket 5 at its upper end carries an arcuate member 7 disposed in a vertical plane, thls arcuate member being attached to the bracket at the center of its arch, at which point there is provided a binding post 8. In the free ends of the arcuate member 7 there are carried the screws 9, the two pointing toward each other so that either may be engaged by a resilient arm 10 whose one end is positioned between them and whose other end is swing- Specification of Letters Patent.

Patented July 12, 1921.

Serial No. 264,397.

lngly secured to the upright portion 2. The arm 10 is made preferably of flat steel and isbent back on itself to form an eye 11 engaging a loop carried by the upright portlOIl 2.

Carried upon the arm 1 there is a double watertype of thermostat 12 on top of which there 1s carried a rubber lug 13 to which the resilient arm 10 is attached.

The alarm apparatus comprises a bell 14 and battery 15, one terminal of the bell being connected to one terminal of the battery by a wire 16 and the other terminal of the battery being connected to the bindin post 8 by a wire 17. A wire 18 connects t e remaining terminal of the bell with a binding post 19 which is carried by the upright 2.

Obviously the rising or falling of the temperature within the incubator will so affect the thermostat 13 that the resilient arm 10 will be raised or lowered, depending upon whether the heat rises or falls. In either instance, however, the free end of the' arm 10 will ultimately be brought into contact with one of the screws 9 whereupon an elec trical circuit will be established for the; bell 14, current flowing from the battery 15 over the wire 16, through the bell, over the wire 18, or. to the upright 2, over the arm 10, on to the arcuate member 7 through one of its screws with which the arm 10 contacts, and over the wire 17 back to the battery.

' It is obvious that the screws 9 may be adjusted to increase or decrease the ran e through which the apparatus will work. t is apparent also that the bottom screw ma be adjusted so that an alarm will be soun ed immediately on the first dropping below normal temperature. The screws 9 may be so adjusted, that a considerable rise above or below normal temperature may be afi'ordcd before the operation of the alarm.

The invention having been described what is claimed is A heat operated circuit c.oser comprising a bracket composed of a horizontal arm and an upright arm of which the latter is adapted for attachment to the side wall of an incubator, a thermostat disposed on the horizontal arm of the bracket, a swinging arm composed of a metal strip one end of which extends back on itself to provide an eye which engages a loop carried by the upright portion of the bracket, an L-shaped bracket one leg of which is secured to the outer extremity of the horizontal arm but insulated therefrom, and an arcuate member disposed to the free extremity of the swinging arm with its ends above and below the plane of the latter and provided with terminal adjusting screws for contact with the extremity of the swinging arm, for the 10 purpose specified.

In testimony whereof I aflix my signature.

ARTHUR- OLSON. 

